Question

9x la puterea a doua - (3x-2) la puterea a doua=?

Answer 1

9x^2-(3x-2)^2=9x^2-(9x^2-12x+4)=9x^2-9x^2+12x-4=12x-4=4(3x-1)

Answer 2

${9x}^{2} - {(3x - 2)}^{2}$
Folosesti formula (a-b)(a+b)=a^2-b^2
[3x-(3x-2)]*[3x+(3x-2)]
(3x-3x+2)*(3x+3x-2)
**3x se duce cu -3x si ramane doar 2
2(6x-2)
Dai factor comun pe doi in paranteza
2*2(3x-1)
4(3x-1)